Load Specifications
Load data in caliber 6.5-300 Weatherby Mag. with .264 | 144gr | Berger Long Range Hybrid Target bullet and 49 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ADI AR 2218, Vihtavuori N570 and Alliant Reloder-33.
Important Notice: DO NOT go below Minimum Charge or above Maximum Charge. Since we have no control over the equipment and components used, any responsibility and liability for the results achieved is rejected.
Only powders/loads that match the current filter criteria are displayed: max pressure of a load ≤ 90% of max. standardized pressure, fill rate ≥ 80% and propellant combustion ≥ 95%. Use the sliders above the tables to adjust these thresholds.
Charge: Powder weight in grains. Start with the minimum load and work up carefully.
FR (Fill Rate): Case fill as a percentage. Values above 100% mean compressed loads.
MaxP / %: Maximum chamber pressure in bar and as a percentage of the standardized maximum for this caliber.
V(0): Muzzle velocity in feet per second (fps) at the standardized barrel length.
z (Powder Burn): Estimated propellant combustion percentage at bullet exit.
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Max Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 84% | 57,348 psi | 88% | 2894 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 53,388 psi | 82% | 2940 fps | 97.8% |
| Accurate MAGPRO | <<locked>> | 82% | 56,739 psi | 87% | 3009 fps | 99.7% |
| ADI AR 2209 | <<locked>> | 82% | 58,131 psi | 89% | 2979 fps | 100% |
| ADI AR 2213 | <<locked>> | 84% | 57,203 psi | 88% | 3002 fps | 100% |
| ADI AR 2217 | <<locked>> | 92% | 56,753 psi | 87% | 2989 fps | 100% |
| ADI AR 2218 | <<locked>> | 96% | 57,566 psi | 89% | 3123 fps | 99.3% |
| ADI AR 2225 | <<locked>> | 94% | 56,797 psi | 87% | 3012 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 57,769 psi | 89% | 2966 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 84% | 57,754 psi | 89% | 2995 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 84% | 56,101 psi | 86% | 2894 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 88% | 57,130 psi | 88% | 2976 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 92% | 55,419 psi | 85% | 3025 fps | 98.6% |
| Alliant Reloder-50 | <<locked>> | 96% | 55,825 psi | 86% | 3022 fps | 98.3% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 57,159 psi | 88% | 2963 fps | 99% |
| Bofors RP15 | <<locked>> | 86% | 57,188 psi | 88% | 2986 fps | 100% |
| Bofors RP30 | <<locked>> | 90% | 56,884 psi | 88% | 3002 fps | 100% |
| Bofors RP5 | <<locked>> | 84% | 57,754 psi | 89% | 2995 fps | 100% |
| Hodgdon H1000 | <<locked>> | 90% | 58,160 psi | 90% | 3005 fps | 100% |
| Hodgdon H4831 | <<locked>> | 82% | 55,738 psi | 86% | 2930 fps | 99.8% |
| Hodgdon H4831 SC | <<locked>> | 84% | 58,479 psi | 90% | 2976 fps | 99.9% |
| Hodgdon Retumbo | <<locked>> | 88% | 57,043 psi | 88% | 3071 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 38,058 psi | 59% | 1906 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 82% | 55,666 psi | 86% | 2907 fps | 99.8% |
| IMR 7828 SSC | <<locked>> | 84% | 55,811 psi | 86% | 2986 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 90% | 57,986 psi | 89% | 2920 fps | 96.5% |
| IMR 8133 Enduron | <<locked>> | 96% | 55,753 psi | 86% | 2999 fps | 100% |
| Lovex S071 | <<locked>> | 88% | 55,999 psi | 86% | 2874 fps | 100% |
| Norma 217 | <<locked>> | 96% | 57,305 psi | 88% | 3022 fps | 100% |
| Norma MRP | <<locked>> | 82% | 57,899 psi | 89% | 3005 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 57,522 psi | 89% | 3012 fps | 100% |
| Ramshot Magnum | <<locked>> | 86% | 55,941 psi | 86% | 2936 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 39,233 psi | 60% | 1952 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 88% | 57,667 psi | 89% | 3058 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 90% | 56,579 psi | 87% | 3025 fps | 99.8% |
| Rottweil R 904 | <<locked>> | 82% | 58,233 psi | 90% | 2946 fps | 100% |
| Rottweil R 905 | <<locked>> | 82% | 57,798 psi | 89% | 2963 fps | 100% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 55,143 psi | 85% | 2949 fps | 97.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 57,435 psi | 88% | 2959 fps | 100% |
| Somchem S385 | <<locked>> | 82% | 57,856 psi | 89% | 2927 fps | 100% |
| Vihtavuori N165 | <<locked>> | 86% | 58,102 psi | 89% | 2920 fps | 100% |
| Vihtavuori N170 | <<locked>> | 90% | 57,653 psi | 89% | 2959 fps | 97.8% |
| Vihtavuori N555 | <<locked>> | 82% | 57,914 psi | 89% | 2927 fps | 100% |
| Vihtavuori N560 | <<locked>> | 82% | 57,159 psi | 88% | 3012 fps | 99.9% |
| Vihtavuori N565 | <<locked>> | 88% | 58,697 psi | 90% | 3015 fps | 100% |
| Vihtavuori N568 | <<locked>> | 90% | 57,087 psi | 88% | 3031 fps | 99.6% |
| Vihtavuori N570 | <<locked>> | 92% | 58,668 psi | 90% | 3100 fps | 98.8% |
| Winchester StaBALL HD | <<locked>> | 84% | 57,566 psi | 89% | 2989 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 84% | 57,638 psi | 89% | 2927 fps | 100% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 80% | 50,256 psi | 77% | 2785 fps | 100% |
| Accurate 8700 | <<locked>> | 96% | 46,195 psi | 71% | 2808 fps | 96.1% |
| Accurate MAGPRO | <<locked>> | 80% | 52,837 psi | 81% | 2940 fps | 99.3% |
| ADI AR 2209 | <<locked>> | 80% | 54,520 psi | 84% | 2920 fps | 100% |
| ADI AR 2213 | <<locked>> | 80% | 49,705 psi | 76% | 2874 fps | 99.5% |
| ADI AR 2217 | <<locked>> | 80% | 37,376 psi | 58% | 2618 fps | 97.4% |
| ADI AR 2218 | 77.7 gr | 88% | 42,728 psi | 66% | 2822 fps | 95.4% |
| ADI AR 2225 | <<locked>> | 80% | 34,722 psi | 53% | 2589 fps | 99.1% |
| Alliant Reloder-19 | <<locked>> | 80% | 54,099 psi | 83% | 2910 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 80% | 50,430 psi | 78% | 2874 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 80% | 49,342 psi | 76% | 2792 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 43,526 psi | 67% | 2753 fps | 100% |
| Alliant Reloder-33 | 77.3 gr | 86% | 44,382 psi | 68% | 2812 fps | 96% |
| Alliant Reloder-50 | <<locked>> | 90% | 44,744 psi | 69% | 2808 fps | 95.4% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 46,934 psi | 72% | 2779 fps | 97.2% |
| Bofors RP15 | <<locked>> | 80% | 47,094 psi | 72% | 2808 fps | 99.7% |
| Bofors RP30 | <<locked>> | 80% | 40,567 psi | 62% | 2694 fps | 98.3% |
| Bofors RP5 | <<locked>> | 80% | 50,430 psi | 78% | 2874 fps | 100% |
| Hodgdon H1000 | <<locked>> | 80% | 40,770 psi | 63% | 2697 fps | 98.9% |
| Hodgdon H4831 | <<locked>> | 80% | 52,069 psi | 80% | 2871 fps | 99.5% |
| Hodgdon H4831 SC | <<locked>> | 80% | 51,024 psi | 79% | 2851 fps | 99.4% |
| Hodgdon Retumbo | <<locked>> | 80% | 42,728 psi | 66% | 2815 fps | 99.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,587 psi | 44% | 1703 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 52,344 psi | 81% | 2848 fps | 99.6% |
| IMR 7828 SSC | <<locked>> | 80% | 48,646 psi | 75% | 2861 fps | 99.5% |
| IMR 7977 Enduron | <<locked>> | 88% | 54,476 psi | 84% | 2864 fps | 95.7% |
| IMR 8133 Enduron | <<locked>> | 80% | 32,343 psi | 50% | 2507 fps | 95% |
| Lovex S071 | <<locked>> | 80% | 43,453 psi | 67% | 2664 fps | 100% |
| Norma 217 | <<locked>> | 80% | 32,837 psi | 51% | 2533 fps | 97.6% |
| Norma MRP | <<locked>> | 80% | 54,099 psi | 83% | 2946 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 49,516 psi | 76% | 2881 fps | 99.7% |
| Ramshot Magnum | <<locked>> | 80% | 44,730 psi | 69% | 2749 fps | 99.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,530 psi | 45% | 1745 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 42,424 psi | 65% | 2792 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 38,928 psi | 60% | 2680 fps | 96.3% |
| Rottweil R 904 | <<locked>> | 80% | 54,708 psi | 84% | 2894 fps | 99.9% |
| Rottweil R 905 | <<locked>> | 80% | 54,027 psi | 83% | 2904 fps | 100% |
| SNPE Vectan SP 13 | <<locked>> | 94% | 44,860 psi | 69% | 2756 fps | 95.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 53,679 psi | 83% | 2900 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 54,157 psi | 83% | 2871 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 47,703 psi | 73% | 2753 fps | 99.9% |
| Vihtavuori N170 | <<locked>> | 84% | 47,123 psi | 73% | 2769 fps | 95.4% |
| Vihtavuori N555 | <<locked>> | 80% | 54,172 psi | 83% | 2871 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 53,417 psi | 82% | 2949 fps | 99.7% |
| Vihtavuori N565 | <<locked>> | 80% | 44,860 psi | 69% | 2766 fps | 98.6% |
| Vihtavuori N568 | <<locked>> | 80% | 40,030 psi | 62% | 2700 fps | 96.1% |
| Vihtavuori N570 | 72.7 gr | 84% | 44,135 psi | 68% | 2825 fps | 95.4% |
| Winchester StaBALL HD | <<locked>> | 80% | 49,734 psi | 77% | 2874 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 50,285 psi | 77% | 2808 fps | 99.9% |
Recommended = one of the top powders for this cartridge and bullet combination.
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 49 powders for 6.5-300 Weatherby Mag. loaded with the .264 | 144gr | Berger Long Range Hybrid Target. ADI AR 2218 delivers the highest muzzle velocity at 3,123 fps; across all powders the maximum-charge window runs from 1,906 fps to 3,123 fps. Accurate 8700 gives the best case fill at 100 %, and 49 of the 49 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (448 MPa), the top charges use 59–90 %, leaving at least 10 % headroom. The 144.0 gr projectile in 0.264" calls for a 1:8.5 twist; slower twists will usually not stabilise this weight. Accurate 8700, Hodgdon TrailBoss, ReloadSwiss RS 14 reach 100 % fill or more at maximum charge, so these are compressed loads: they need a long drop tube to seat cleanly and react sensitively to the case capacity of your own brass lot. ADI AR 2218, Vihtavuori N570, Alliant Reloder-33 rank at the top here: for 6.5-300 Weatherby Mag. with the .264 | 144gr | Berger Long Range Hybrid Target they combine a high case fill with complete burn and sit in the upper velocity band. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.